GT80 do not have internal battery,which should be powered from vehicle OBD.Foxwell GT80 scanner highlight:

1 10.1” TFT color capacitive screen with resistive touch panel

2 Automatic vehicle identification by VIN

3 Compatible with the latest 2015/2016 models

4 Get access to powertrain, chassis and body systems
5 Quick Test function automatically scans all diagnosable electronic control units on a vehicle, instantly displays all the errors detected on the vehicle along with codes and descriptions, and allows errors to be viewed and erased with a single click.
6 Merge interactive live sensor graphs for easy and intuitive diagnosis
7 Live data self learning and alarm when live data over range
8 Record and playback your data logs for offline analysis
9 Key coding for several vehicles